restarting interrupted setup downloads

[Yitzchak Scott-Thoennes]

When using mirrors.rcn.net, I often get connections dropped at ~ even
megabyte points during the download when on a low speed connection.

After setup has done it's best, I run the following in the local
package directory (named "cygwin") to pick up the files that weren't
correctly, and then run setup to install them:

perl -nwe'/\\cygwin\/(.*) wrong size/ && ($url = $dir = $1) && $url =~ s/%3a/:/ && $url =~ s/%2f/\//g && $dir =~ s/(.*)\/.*/$1/ && print "(mkdir $dir; cd $dir; wget -c $url)\n"' setup.log.full | bash

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